Piston



FIG. 1 is a perspective view of a piston showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan, view thereof.

The broken lines are for the purposes of illustrating portions of the piston and form no part of the claimed design. 

CLAIM The ornamental design for a piston, as shown and described. 